Heated insole remote control systems

ABSTRACT

A remote control wireless heated insole system in which address data identifying specific insoles to be heated is provided. Once the heating process is initiated, periodic repeated control signals are generated to cause heating of the insoles.

RELATED APPLICATIONS

This application is based on Provisional Patent Application Ser. No.61/427,509, filed Dec. 28, 2010, the contents of which are incorporatedherewith and the priority of which is claimed.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a remotely controlled heated insole forfootwear and to an improved method of control of such heated insolesthat provides a more reliable means of ensuring that the temperaturedesired by the user is realized.

BRIEF DESCRIPTION OF THE INVENTION

The present invention is directed to heating insoles of footwear, andimproving the ability to realize desired temperatures through wirelesscontrol signals. Heated insoles are intended to aid a user inwithstanding cold weather by providing supplementary heat in the casewhere normal body heating is not enough or when additional heat isdesired to be more comfortable. When an extremity of the body starts tobecome cold, the body's natural physiological response ofvasoconstriction occurs in which the nervous system restricts blood flowto the cold extremity in an effort to keep the rest of the body warm. Itis well known that frostbite and other cold related injuries occur firstin fingers and toes due to vasoconstriction and keeping theseextremities warm will help insure survival or at minimum a morepleasurable outdoor experience.

Heated insoles are a key component to preventing injury in cold weatherand are well known to hunters and outdoorsmen as standard survival gearwhile in the woods or forest. A problem exists however in the control ofsuch insoles as often the insole temperature needs to be adjusted toaccommodate different conditions and comfort levels. Standardtemperature adjustment methods require the user needs to remove his orher boot to gain access to the insole in order to make desiredadjustments. Not only is this procedure time consuming but removing theuser's foot from the boot to gain access to the insole exposes the footto the cold conditions. This adjustment procedure undoubtedly lowers thefoot temperature even further thereby further increasing risk or injury.

An improved method of control has been developed however utilizing ahand held remote control system which employs a transmitter unitexternal to the insole and a receiver unit located within the insoleassembly inside the boot. The desired heat adjustment is then performedby the user selecting a heat setting on the hand held remote unit whichis then wirelessly transmitted to the receiver unit located within theheated insole assembly. Although this improved method of control is animprovement, the design requirements for a proper fitting heated insoleyields conditions not optimum for wireless control as will be pointedout in the following discussion.

Heated insoles are placed in a shoe with its bottom surface against thebottom of the shoe and the upper surface against the user's foot when inuse. Antenna placement within the insole is positioned parallel to theground surface and also to the foot placed above it. A problem exists inthe prior art however in which this restrictive antenna positioningtends to prohibit the reception of information transmitted from the handheld unit to the receiver unit due to the signal grounding effectproduced by the earth's surface on the bottom and the user's foot on topof the antenna. This grounding effect is often severe enough that itinhibits information from the transmitter to the receiver unit,therefore preventing any heating adjustments to be made.

Additionally, the location of the RF receiver, inside shoes, adjacent tothe ground requires special consideration to overcome signal loss. Priorart radio controlled insoles include the wire antenna along the midlineof the insole. This has been problematic because signal strength isaffected. The inventors realized that much of the transmitted signal isblocked by the ground from reaching the receiver antenna located in theinsole. The foot and body of the wearer also tend to block the signal.One improvement of this invention for the receiver antenna is to locateit more advantageously for signal reception, for instance, near theouter margin of the insole. Reception is materially improved with suchan antenna.

The present invention includes a heated insole device that uses radiofrequency communication with an improved transmission system to controlthe desired insole temperature. The present invention uses a standardfrequency of 433 Megahertz but may be used with other frequencies, suchas the common 2.4 Gigahertz.

As described above, the manufacturing of an insole product requires thatthe device itself be relatively flat and fit within a standard shoe orboot. This requirement forces the necessary power source, controlmethods and communication means to all exist within the confines of theshoe and lie in a flat plane parallel to the earth's surface. Althoughthis space limitation is achievable with good design practice, radiocommunication suffers largely due to the horizontal orientation of theantenna, its proximity to the earth and the person standing above it.Furthermore, transmission at the frequencies described above is dictatedby governing authorities to be a limited transmission of a just a fewseconds per hour, so the notion of continuous transmission, if even inthe power budget, would be prohibited.

The present invention also discloses a system and method ofcommunication that helps to ensure that user commands are moreeffectively transmitted by providing a plurality of transmissions atspecific spaced intervals of time. By providing discrete, timedtransmissions after the user temperature control has been initiated, theprobability of transmissions coinciding with the user taking a step andlifting his foot off the ground is increased. The timed control signalmay be initiated by the remote or may be controlled by a microprocessorwithin the insole. With the foot off the ground, the distance betweenthe horizontally placed antenna within the insole and the earth'ssurface is greatly increased, thus increasing the reception range forthe insole. A secondary action that occurs while a foot is in the air isthat the pressure of the person wearing the shoe is relieved from theinsole, decompressing the foam some measurable amount between theantenna and the person. This decompression although small, tends toincrease the transmission success thus providing a better userexperience.

For example, it is well known that an adult person walks at a rate ofthree miles per hour, which equates to four feet per second with astride length of about eighteen inches. This stride and pace suggestsapproximately 2.6 steps be taken every second.

Since bipedal humans alternate feet while walking, this suggests thateach foot is lifted off the ground every 1.3 seconds or approximatelyonce per second.

Knowing that each foot is off the ground once per second for almost asecond, allows more robust communication by providing transmissions thatoccur while the foot position is in the air and not on the groundsurface. Transmissions every half second will insure some of thebroadcasted signal will be simultaneous with the foot being in the air,thus delivering the intended command to the insole device. Other timeperiods may be chosen in accordance with prevailing governmentalregulation.

For skiers or snowboarders who use this invention, the position of thefoot also shifts from purely horizontal to some vertical orientation,such as when a skier uses edges or a boarder shifts positions. Stillfurther, the heating operation may occur while the user is in a liftchair which also alters the orientation of the sole.

Transmitting the sequence of coded signals periodically for a shortperiod of time after the initiation of the process to heat the insoleincreases the ability of the user to more effectively communicate theheating instructions to the insole.

The instant invention includes a battery powered electrically heatedpair of insoles that are in radio communication with a key fob R/Ftransmitter. The battery is a lithium ion polymer battery and isprovided with a self-contained conventional protective circuit. Thetransmitter sends out an encoded signal to be received and decoded by aunique pair of insoles. The insole has an on/off switch. This switch maybe placed in the on position before the insole is placed inside theshoe.

When the switch is placed in the on position, the insole does notproduce heat, but the R/F system in the insole is ready to receivecommands from the key fob transmitter. Each insole has an on/off switchand may have a unique code permitting selected insoles to be heated.When both switches are on, both insoles will respond to the key fobtransmitter. The user may utilize the key fob transmitter to selectamong; no heat, medium heat, and high heat by pressing the appropriatebutton on the key fob transmitter. Settings other than discrete may beused.

When a heat setting is selected on the key fob transmitter, the RFreceiver in the insole detects the signal and, if intended for aspecific insole, activates the process therein. The microprocessorsenses the temperature near the heater, and if the temperature is toolow for the selected setting, current flows from the battery to theheater until a thermistor reaches a predetermined temperature. Thethermistor generates a signal which is sent to the microprocessor. Themicroprocessor controls the flow of current to achieve and maintain thedesired temperature until the user selects another setting. Othermethods of controlling the heat in the insole may be employed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of the transmitter unit;

FIG. 2 is a block diagram of the electronic circuit within the insole;and

FIGS. 3A and 3B are partial sectional views of the insole showing thelocation of the antenna in the present invention and in the prior art.

DETAILED DESCRIPTION

FIG. 1 is a block diagram showing the transmitter 10 of this invention.The transmitter comprises an integrated circuit S14010 which isconnected to a plurality of push buttons 12, 14 and 16. The push buttonsgenerate signals to cause high, medium and no heat conditions,respectively, to be generated within the insole. The user selects a pushbutton to be activated in order to control the temperature within theinsole.

An LED 18 may be connected to the transmitter to indicate that thetransmitter is transmitting and/or to indicate that the transmitter ison and capable of transmitting. An antenna 19 connected to thetransmitter wirelessly transmits electronic signals generated intransmitter 10 to the electrical circuit within the insole.

The transmitter 10 decodes the user command by determining which of thepush buttons is selected, and the transmitter provides a burst of fourpackets of information or electrical signals with each packet consistingof an address and data. The packet length, by example, is 120 ms inlength and the entire four packets takes approximately 512 ms totransmit. To ensure the command is received properly, the four packetsequence is repeated every 15 seconds over the next minute for a totalof 20 packets. This is within current FCC regulations.

Referring to FIG. 2, there is shown an electrical circuit located withinthe insole. Transmitted data packets are received and decoded throughreceiver 24 and connected to microcontroller 26. The decoded signal issent to the microcontroller for processing, which creates a controlsignal for heater control 28 to achieve the desired temperaturecondition for the insole. Additionally, the address data identifies theinsole to be controlled. The heater control 28 is connected to heaterassembly 30 located within the insole to heat the insole to a desiredtemperature. The heater assembly also includes a temperature sensingdevice such as a thermistor to determine the real time temperature ofthe heated insole to determine if further heating is required undercontrol of microcontroller 26.

The microcontroller 26 and heater assembly 30 are powered by a 4.2 voltlithium ion polymer battery 32 having an internal safety circuit 34.

The lithium battery 32 is recharged by using an external DC charger 22connected to input jacks 36 located within the insole. The charging isthus controlled outside of the insoles. A voltage limiter 38 isconnected to the output of the external charging input to ensure thatthe voltage supplied to recharge battery 32 is maintained below acertain level. Battery charging is achieved by using the externalcharger to control voltage and current to the batteries, and the voltagelimiter 38 provides fine voltage control to optimize battery charging.An LED 23 is provided with the external DC charger 22 to display thebattery status so it can be determined when the battery has beensufficiently charged, and the external charger may be unplugged from theinsoles. A three volt regulator circuit 42 is provided to ensure thatthe microcontroller and heater assembly properly operate. The controlcircuit for the system shown in FIG. 2 includes voltage regulator 42 tocontrol the voltage at microcontroller 36.

Locating the protective circuit 34 within the battery is an improvementover having a protective circuit outside of the lithium battery.Providing the protective circuit within the lithium battery is importantbecause if the battery leads short circuit, a hazard will be preventedby having the protective circuit therein. If the protective circuit isremote from the lithium battery, damage from such short circuit to thebattery will not be prevented.

In normal use, the user sets the on/off switch 44 to the on position inthe insole to allow the battery voltage to control the electroniccircuitry therein. The microcontroller 26 receives a command signal fromRF receiver 24 and decodes the information to see if the unique addressmatches that of the insole. If such a match is found, themicrocontroller then determines from the command signal the heat settingwhich is desired. Once such heat setting is decoded, the microcontroller26 then commands the control circuit 28 to turn on the heater andmaintain a desired heating set point. This continues until the userswitches the on/off switch to off or the battery power is exhausted.Additionally, there is a heat control (No Heat) in the transmitter whichalso can turn off the heating unit.

The instant invention includes a battery powered electrically heatedpair of insoles that are in radio communication with the key fob R/Ftransmitter 8 (see FIG. 1). The transmitter 10 sends out an encodedsignal that may be received and decoded by a unique pair of insoles.When the switch in the insole is on, the insole does not produce heat,but the R/F system in the insole is ready to receive commands from thekey fob transmitter. Each insole has its own on/off switch. When bothswitches are on, both insoles may respond to the key fob transmitterdepending on the address data. The user may utilize the key fobtransmitter 8 to select among; no heat, medium heat, and high heat bypressing the appropriate button on the key fob transmitter 8.

When a heat setting is selected on the key fob transmitter 8, the RFreceiver 24 in the insole detects the signal and activatesmicroprocessor 26. The microprocessor 26 senses the state of atemperature measuring thermistor located near the heater, and if thetemperature is too low for the selected setting, current flows from thebattery 32 to the heater 30 until the thermistor reaches a desiredtemperature. Then, the microprocessor 26 reduces the flow of current tokeep the predetermined temperature. The temperature is maintained untilthe user selects another setting.

The location of the RF receiver, inside shoes, adjacent to the groundrequires special consideration to overcome signal loss. Prior art radiocontrolled insoles locate the wire antenna 40 along the midline of theinsole (see FIG. 3 b). This has been problematic because signal strengthis not sufficient. Much of the transmitted signal is blocked by theground from reaching the receiver antenna located in the insole. Thefoot and body of the wearer also tend to block the signal. The receiverantenna 42 of this invention is located near the outer margin of theinsole (see FIG. 3 a).

When the user is ready to recharge the batteries, the insoles may beremoved from the shoes and the switches are placed in the off position.In the alternative, the charging jacks may be available from outside thefootwear by suitable protective waterproofing of such jacks.

It should be understood that the preferred embodiment was described toprovide the best illustration of the principles of the invention and itspractical application to thereby enable one of ordinary skill in the artto utilize the invention in various embodiments and with variousmodifications as are suited to the particular use contemplated. All suchmodifications and variations are within the scope of the invention asdetermined by the appended claims when interpreted in accordance withthe breadth to which they are fairly legally and equitably entitled.

1. An improved system for remotely causing an insole of an item offootwear to be heated, said system comprising: a remote transmittertransmitting a wireless control signal initiating a process to increasethe temperature in said insole to adjust the temperature of a heatingelement in said insole, said wireless control signal comprising a seriesof electronic signals, an electronic circuit contained within saidinsole, said electronic circuit comprising a receiver contained toreceive said wireless control signal, a microprocessor, saidmicroprocessor comprising means to sense a real time temperature of saidinsole, said microprocessor generating control signals to cause saidheating element in said insole to be adjusted to achieve said desiredtemperature, said system generating periodic repeated control signalsupon initiating said process to control heating of said insole inresponse to said control signal.
 2. An improved system according toclaim 1, wherein said periodic signals are automatically sent by saidtransmitter after initiation of said process to increase the temperaturein said insole.
 3. An improved system according to claim 2, wherein saidperiodic signals are initiated by a single control signal generated insaid transmitter.
 4. An improved system according to claim 3, whereinsaid single control signal is triggered by a switch in said transmitter.5. An improved system according to claim 4, wherein said switch isdepressed once to initiate said heating process.
 6. An improved systemaccording to claim 1, wherein said periodic signals are generated bysaid microprocessor upon receipt of said control signal from said remotetransmitter.
 7. An improved system according to claim 1, wherein saidperiodic signals are generated for less than a five minute total periodof time.
 8. An improved system according to claim 6, wherein saidperiodic signals are generated for less than a two minute total periodof time.
 9. An improved system according to claim 7, wherein saidperiodic signals are generated approximately every fifteen seconds. 10.An improved system according to claim 1, wherein said insole comprises aflat rechargeable ion lithium battery, said electronic circuit furthercomprising a voltage regulator connected to said lithium battery toregulate the voltage of said lithium battery.
 11. An improved systemaccording to claim 10, wherein said electronic circuit in said insolefurther comprising a voltage limiter connected to said lithium battery.12. An improved system according to claim 1, further comprising housingmeans in said insole for said lithium battery, said housing meansenabling said lithium battery to be easily removed from said insole, anda replacement lithium battery to be placed in said housing to providepower for said insole.
 13. An improved system according to claim 1,further comprising an antenna in said electronic circuit, said antennalocated in the periphery of said insole.
 14. An improved systemaccording to claim 1, wherein said wireless control signal comprisesunique insole identification data and control data, said insole to beheated identified by said insole identification data.
 15. An improvedsystem according to claim 14, wherein said unique insole identificationdata comprises data to identify more than one insole to be heated. 16.An improved system according to claim 1, further comprising heatedinsoles powered by ion lithium polymer batteries, said batteries havingsafety circuits located within said battery, and safety circuits locatedbetween battery poles and connecting wires.
 17. An improved systemaccording to claim 16, wherein said batteries comprise input jacksconnected to recharging sources outside of said insoles.